The Gym battle with Homika continues. With her Pokémon managing to poison Ash's with great ease, Ash faces his toughest challenge of Unova yet. As more of his Pokémon get poisoned and start to fall, Ash starts to lose the will to continue. Will Ash overcome this devastation and earn the Toxic Badge?

Finally arriving in Undella Town to start training for the World Tournament, Ash & co. meet up with a very old friend, Dawn, who has arrived to train to become a better co-ordinator. Cilan is eager to see how a Pokémon Co-ordinator battles and so challenges Dawn to a battle. In addition to that, Meloetta has decided to tag along with Ash & Co, but Team Rocket still have their eye on it...